[1] UNIV PARIS SUD, F-91405 ORSAY, FRANCE
[2] ECOLE PRACTIQUE HAUT ETUD, F-69002 LYON, FRANCE
[3] FAC SCI REIMS, F-5100 REIMS, FRANCE
[4] UNIV PARIS 06, F-75005 PARIS, FRANCE
[5] CNRS, F-91405 GIF SUR YVETTE, FRANCE
[6] UNIV NANCY 1, F-54037 NANCY, FRANCE
[7] INST NATL SCI APPL, F-69621 VILLEURBANNE, FRANCE
[8] CTR UNIV MARSEILLE LUMINY, F-13288 MARSEILLE, FRANCE
[9] COLL FRANCE, F-9130 NOGENT SUR MARNE, FRANCE